Slide feed-valve.



J. P. MURPHY.

SLIDE FEED VALVE. I

APPL1cAT1oN man FEB. 9. 1915.

1,166,242.- Patented 1180.28, 1915.

2 SHEETS-SHEET l. 'f .,7. A 5

LVIII 1. P. MURPHY. 'SLIDEPEED vALvE. APPLICATION FILED FEB. 9. 1915.

1, 166,242. Patented Dec. 28, .1915.

2 SHEETS-SHEET 2.

'UNITED STATES PATENT onirica. .reniery nourrir, or cnsafas'roiv, SOUTH CAROLINA. y

SLIDE FEEDVALVE.

1,166,242. Specification of Letters Eatent.

Patented Dee. 2s, 1915.

Application Ied February 9, 1915. Serial No. 7,028.

lTo'` all 'whom 'it may concern: n

, Be it known that, JOHN P. MURPHY, a :citizen of 'the .United States,` residing at View 'through a slide feed valve constructed I in accordance With this invention. F ig. 2 1s a vertical longitudinal sectional view 4 Charleston, in the county of Charleston and State of South Carolina, have invented'cer- `tain nevv and useful'lmprovements inSlide 'Feed-Valves; and I do declare the followthrough the same.` Fig. 3 is a vertical transverse sectional view through the slide valve taken on line 3-3 lof Fig. 4, and Fig. 4 is a vertical longitudinal sectional view v ing'to be a full, clear, and exact description ofthe invention, such .as vvill enable others 19. skilled inthe art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to the letters and figures ofreference marked thereon, which form a part of this specifi- 15- cation.-

This inventionrelates to a slide feed valve for railroad air-brake systems and has for rits object to provide a valve which Will remain tight under service conditions, so that 20 the proper operative pressure Acan be maintained.

For a complete @understanding of this i valve it will be stated that the pressure lead to the valve is maintained 'at 90 lbs'. and it pressure passing from the valve be maintained at 70 lbs. Under the iniiuence of pressure the valves as heretofore constructed quickly become Worn to such an extent that the pressure from the'valve rises abovethe proper `effective pressure, and at times to such an extent that the pressure lead to the valve and from the valve becomes balanced and hampersthe proper action ofthe airbrake system. In order to obviate and prevent lthisleakage of pressure so that the pressure from the valve will not exceed the effective AWorking pressure of 7 0 lbs. and to insure a strong and serviceable construction consists in the novel construction of the slide` valve, so `that the slide will notonly be maintained ina tight and serviceable condition When' first applied', but 'will remain in a tight and serviceable condition under influences of wear,l so that the necessity of renewal of the slide becomes practically eliminated.

The invention also consists in certain details of construction of the slide valve, all of which will be first fully described and afterward specifically pointed out inthe appended claims.

Figure 1 is a vertical transverse sectional is required for proper-operation -that the the manner as shown in Fig. 1.

at 90 lbs., which seriously interferes With Referring to the accompanying drawings,-

through'the slide valve and piston taken on line 4 4 of Fig. 3. l

4Lilie numerals of reference indicate the same parts' throughoutl the several figures, in Which- 1 indicates the casing of the slide feed valve Which is providedwith a flange 2 for Y proper attachment by means of bolts or fastenings passed through the openings 3 in the flange 2. Entering the flange 2 is the pressure feed port 4 communicating with the port 5 in thebushing 6, which receives the slide `valve, said'bushing 6 being provided 'longitudinally thereof with a smooth fiat channel 7 and in said channel near the inner end thereofwith a transversely elongated port 8, which is in 'communication with the .port or passage?) Which leads the pressure from the valve out of the flange 2 Co1n municating with the portor passage 9 is a vertical port or passage 10 opening at 11 behind a diaphragm 12, which diaphragm is commanded by a spring-adjusting device 13. for regulating the tension of the diaphragm. Arrangedbehind the diaphragm 12 is a valve 14 having a stem 15 passing freely through a port 16 and in engagement with the face'of the diaphragm 12, the valve v14 being resiliently held in position by means of the spring 17. A

The chamber 1S Within which the valve 14 is housed is provided with a port 19, which communicates with the passage 2O shown in dotted lines in Fig. 1 and in dotted and infull lines in Fig. 2, which passage 20 communicates with a port 21 entering the chamber 22'within which chamber the'piston 23 operates.

,Referring now to Fig. 4 it will be seen that the piston 23 is provided with a stem 24 which carries the slide 25 in the following, manner. The stein 24 which 'enters the bushing orclining 6 of the valve is provided 'transversely thereof with an opening or perforation 26, while the slide 25 is bifurcated in the manner as shown inFig. 3, so that the' arms or walls 27 straddle the stem 24 and is guided thereby. The bottom poror opening 26 in the stem 24 is ai spiralV spring 29 having its lowerend normally bearing upon the lower portion of the'slide 29 is a pin and Within said spiral spring or plunger 30 having preferably/a roundedi head 31 for engagement ,with the bushing onli/ning 6 of the valve, the parts being arranged in the manner as'shoivnin Figs. 3 and 4 so that when in assembled=position a resilient yielding pressure is applied to the slide 25 at the `bottom portion thereof to hold the s aid slide in close and intimate engagement with its channel 7 in the bush ing or lining 6, While a mutilated guide disk 32 as shown in elevation in Fig. 1 is formed on the stem 24 for sliding engagement with.

the bushing or lining 6 to prevent cooking of the valve. Y

Having thus described the several parts of this invention its operation is as follows: Pressure being 'led to the device through the feed port 4, the same passes into the bushing or lining 6 -through the port 5 and acts behind the piston 23 to move said piston and slide valve away from the said port 5, 'this movement causing the slide25 to Wholly or partially uncover the port 8 Which iseommanded by the slide 25. As said port is uncovered by the slide 25 pressure passes into the passage 9 and out of the device in the manneras shown in Fig. 1, While the pressure passing into the passage 9 is also led into the vertical passage 10 and out of the port v11 beh-ind the diaphragm 12 andy through the passage 15 past the valve 14 and into the chamber 18, whence it passes out of the port 19 into `the passage 20 shown in vdotted lines in Fig. 1 and from the passage into` the the relative pressures on opposite sides of thev piston 23, which relative pressure is regulated by the tension of the diaphragm 12 in the manner as heretofore described, so that by adjustment of said diaphragm the proper pressure can be caused to pass through the port 8 in the valve bushing or lining and out of the device b v way of the passage 9. Should houeve tlul ide 25 not be properly seated iu its channel i or should by the'construction of the slide 25 and its coperating parts said slide become ivorn' and incapable of its proper adjustment to its Wear, then the pressure entering the port 5 from the feed port 4 will leak past the'slide Y25 and enter .the port-8 arranged to be commanded'thereby and out from the device by Way of the passage 9 irrespective of any' proper longitudinal movement of the slide 25, thus rendering proper adjustment of pressure passing from the device impossible, and seriously interfering with the action of theair-brake system.

I lay no claim to a bifurcated slide having a transverse pin for supporting and holding a leaf spring in engagement with thelcasing to maintain the slide in operative position.

Having thus fully described the invention it is apparent that the construction shown in the accompanying drawings is susceptible to immaterial changes and I consider myself clearly entitled to all such changes and modifications as fall Within the 'limit and scopeof the appended claims.

What I claim as-new and desire to secure by Letters Patent of the United States is'.-

1. A slidefeed-valve including a casing, a chambertherein, a valve including a piston and stem disposed in said chamber, said chamber being provided with a flat longitudinal channel, said casing being provided with a pressure supply port leading to said chamber'on one side of said piston, the said chamber being provided'with a port adjacent the first mentioned port, and provided with a pressure supply port on the other side of said piston, a bifurcated slide straddling'the said'valve stem and operable in said. longitudinal channel in said casing to 10o `cover the said port therein adjacent the first mentined port, the said stem being provided With a transverse perforation, a headed pin arranged in said perforation and guided thereby and having its head in engagement Withv the Wall of said chamber and a coil spring disposed on said pin in said perforation, said spring having one end in engagement with said slide and the other end in engagement with said pin to force the said slide and pin oppositely to securely maintain the said slide in intimate contact with the flat bottom of said longitudinal channel.

2. A slide-feedsvalve including a chamber provided with a longitudinal channel, a valve including a piston and stem in said chamber, said chamber being provided with ports, one of which enters the same in said longitudinal channel, a bifurcated slide y mounted on saidstem and operable in said 12o longitudinal channel to close said port en tering the same, the said stem being provided with a transverse perforation in line `with said slide. a pin in said perforation having a longitudinal channel and a p ort entering the said channel, a valve including a piston and a stem slidable Within said chamber, a slide mounted on said stem and operable 'Within said longitudinal channel said pin in said stem and 1n engagement with said slide to eHectuallV maintain the said Slide in intimate contact with the bottom of said longitudinal channel.

n testimony whereof, I aix my signature, in presence of two Witnesses.

JOHN P. MURPIQY.

'to close said port, a pin disposed in said Witnesses:

stem and having one end in engagement A. A. CRAIG, with the Wall of said chamber, a spring on C. J. MURPHY.

ve cents each, by addressing the Commissioner of Patents,

Copies of this patent may be obtained for v Washingtoml). G." 

